建筑屋顶近壁面湍流动能与太阳辐射温差关系的分析

ANALYSIS OF RELATIONSHIP BETWEEN TURBULENT KINETIC ENERGY AND SOLAR RADIATION TEMPERATURE DIFFERENCE NEAR WALL OF BUILDING ROOF

建筑接收太阳辐射得热后会改变建筑屋顶近壁面的空气温度,而建筑屋顶近壁面的太阳辐射温差与建筑屋顶湍流产生的对流换热会影响光伏组件的工作温度,从而影响搭建于建筑屋顶的光伏组件的性能。以夏季时西安市某未安装光伏组件的建筑屋顶为例,针对上述因素,利用CFD技术并基于ANSYS平台进行了模拟分析。结果显示,建筑屋顶近壁面的湍流动能与太阳辐射温差之间呈正相关性,在该结论的基础可以通过重新组织屋顶气流来改变屋顶壁面温度及光伏组件的工作温度,进而提高光伏组件的性能,以期为今后的进一步研究工作打下基础。

After the building receives the solar radiation heat,it will change the air temperature near the wall of the building roof,and the solar radiation temperature difference between the near wall of the building roof and the convective heat exchange generated by the turbulence on the roof of the building will affect the working temperature of the PV module,thereby affecting the performance of the PV module built on the roof of the building.This article takes the roof of a building without PV modules in Xi’an as an example in summer,and uses CFD technology to simulate the above factors based on the ANSYS platform.The results show that there is a positive correlation between the turbulent kinetic energy near the wall of the building roof and the solar radiation temperature difference.Based on this conclusion,the wall temperature and the working temperature of PV modules can be changed by reorganizing the roof airflow to improve the performance of PV modules.It is hoped that lay the foundation for further research work in the future.